Inputs - 4/20/2015

The facility wide emissions will be displayed on the "Output" sheet.

Facility Profile - User Inputs

What is the number of gasoline only refueling positions at your dispensing facility? 12

0

What is the number of dispensers capable of refueling with either gasoline or diesel? 0

What is the number of heavy-duty (HD) truck diesel refueling positions at your facility? 0

Ozone designation status can be found at http://www.epa.gov/oar/oaqps/greenbk/hindex.html or contact your reviewing authority. nonattainment

Enter either attainment or nonattainment.

What is the current year? 2014

Enter the current year (a number between 2013 and 2030).

3/23/2015

Potential To Emit Calculator for Gasoline Dispensing Facilities - Inputs

This workbook is designed to calculate the potential to emit of your gasoline dispensing facility.

The gasoline dispensing facility (GDF) owner/operator shall provide two pieces of information. These include whether or not the 

GDF is in a designated ozone nonattainment area and the number of vehicle refueling positions at the GDF for both gasoline and 

diesel vehicles. Ozone attainment/nonattainment designation status can be found at 

http://www.epa.gov/oar/oaqps/greenbk/hindex.html .

What is the number of automotive/ nonroad diesel only refueling positions at your facility?

A HD truck (e.g., over the road) refueling position is a single diesel fuel dispenser and its associated nozzle(s). The total number 

of HD truck refueling positions at your facility is the number of HD trucks that can be refueled simultaneously.

These are normally multi-grade dispensers with separate gasoline and diesel fuel nozzles on the 

same dispenser. These are used primarily to refuel automotive and light truck type vehicles.

A vehicle refueling position is a single diesel fuel dispenser and its associated nozzle(s). The total number of automotive/nonroad 

only diesel refueling positions at your facility is the number of automotive-type vehicles (passenger car, light truck)or nonroad 

equipment that can be refueled simultaneously. This count would include free standing aboveground tanks used to refuel nonroad 

equipment.

Directions - Enter the facility's information in the yellow-highlighted boxes below.

A vehicle refueling position is a single gasoline dispensing machine and its associated nozzle(s). The total number of vehicle 

refueling positions at your GDF is the number of gasoline-fueled vehicles that can be refueled simultaneously.
Output - Criteria - 4/20/2015

Potential to Emit (tons VOC/year) 4.348

Potential To Emit Calculator for Gasoline Dispensing Facilities - Outputs

This facility is located in an ozone nonattainment area.

3/23/2015
Drum - Prod.Crit - 4/20/2015

HD truck diesel refueling positions 0

Automotive dispensers with gasoline 

or diesel 0

Automotive/Nonroad Diesel Refueling 

Positions 0

Gasoline Vehicle Refueling Positions 12

Location - Ozone Attainment Status

Max. Gasoline Throughput If No 

Automotive/nonroad Diesel 4,625,280 gallons/year 0

Max. Combined Automotive plus HD 

Truck Diesel Throughput 0 gallons/year

0

Internally fixed values in calculation -- gasoline and automotive/nonroad diesel Internally fixed values -- HD truck diesel

0.25 hours

24 hours/day

365 days/year

11 gal/refueling event

5 %/year

Gasoline VOC Emissions -- apply these values to GDFs using USTs or ASTs7 Diesel VOC Emissions -- apply these values to GDFs using USTs or ASTs

Description 4

VOC Emission 

factor 

(lb/1,000 gal)

Potential to Emit 

VOC (tons/yr)

Add'l Emissions for Small Volume GDFs6 12.0 0.000 27.636

Storage Tank Filling 1 0.30 0.694

Storage Tank Breathing Losses 2 0.25 0.578

Dispensing 3 1.33 3.076

Totals 1.880 4.348

Methodology

Notes:

Emission factors are from AP 42, Chapter 5.2, Transportation and Marketing of Petroleum Liquids, Table 5.2-7, (June 2008), except where noted. 

Number of gallons per refueling event

Max. Automotive/Nonroad Diesel 

Throughput

Max. HD Truck Diesel

Potential To Emit Calculator for Gasoline Dispensing Facilities

1

 Assume Stage 1 controls are in place. 40 CFR 63, Subpart CCCCCC requires that new or modified gasoline dispensing facilities with a monthly throughput greater than 100,000 

gallons per month install Stage 1 vapor balance system that achieves a 90% emissions reduction.

Nonattainment Area

Maximum Throughput (gal/yr) = vehicle refueling positions / refueling event time (hrs) x hours of operation (hr/yr) x fuel dispensed (gal/refueling event)

Potential to Emit of VOC (tons/yr) = Maximum Throughput (gal/yr) x VOC Emission Factor (lb/1,000 gal) x 1 ton/2,000 lbs

Average time between start of refueling events 

Number of hours of GDF operation per day

Number of days per year open for business

Number of gallons per refueling event

Storage Tank Filling 

Storage Tank Breathing Losses

Dispensing

This sheet calculates the maximum fuel throughput, based on the number of vehicle refueling positions at your GDF. The calculations use fixed values for hours of operation, the time 

required for each refueling event, and the average amount of fuel dispensed per refueling event. 

The sheet than calculates the emissions of VOC from your GDF, based on emissions factors and the attainment status of your location. Note that while this calculator is designed 

primarily to address emissions of gasoline vapor, it includes algorithms to account for diesel fuel vapor as well and could even be used if the sole fuel dispensed was diesel. 

Average time between start of refueling events 

Number of hours of GDF operation per day

Number of days per year open for business

3/23/2015

Percent of refueling events which use automotive diesel 

dispensers

Totals

4

 Even though spillage is a specific category of emissions related to fuel dispensing in AP-42, it is considered a fugitive emission for purposes of NSR permits and thus is not included 

here.

2

 40 CFR 63, Subpart CCCCCC requires that new or modified gasoline dispensing facilities with a monthly throughput greater than 100,000 gallons per month install pressure/vacuum 

(PV) vent valves on the storage tank vent pipes. This model uses a 75 percent efficiency for PV valves in reducing breathing losses. 

3

 The displacement VOC emission rate in lbs/1000 gallons depends on the gasoline Reid Vapor Pressure, the dispensed fuel temperature, and the difference between the temperature 

of the fuel in the tank and the dispensed fuel. For these purposes EPA calculated the uncontrolled displacement VOC emission rate in lbs/1000 gallons. EPA has used 10 psi RVP and 

national average summer-time temperatures for ozone attainment areas. This yields a value of about 10.8 lbs/1000 gallons. EPA has used 7 psi RVP and temperatures representative 

of the summer-time western US for ozone non-attainment areas. This yields a value of about 7.5 lbs/1000 gallons. In 76 FR 41723, EPA determined that 80% of the vehicle fleet will 

have ORVR installed as of 2014, and widespread use will be achieved on a national basis on June 30, 2013. Therefore, this value has been reduced by 80% for 2014 and increases 

each year subsequent to 2014 as fleet turnover occurs.

See memorandum to Public Docket EPA-HQ-OAR-2010-1076, Updated Data for ORVR Widespread Use Assessment, Glenn Passavant, OTAQ, 2012 and

U.S.EPA, Guidance on Removing Stage II Gasoline Vapor Control Programs from State Implementation Plans and Assessing Comparable Measures, EPA-457/B-12-001, August 7, 

2012.

Description 4
Drum - Prod.Crit - 4/20/2015

gallons/year

gallons/year

 -- HD truck diesel

es to GDFs using USTs or ASTs

VOC Emission 

factor5

(lb/1,000 gal)

0.040

0.028

0.040

0.108

roughput greater than 100,000 

ues for hours of operation, the time 

while this calculator is designed 

el dispensed was diesel. 

start of refueling events 

F operation per day

ar open for business

SR permits and thus is not included 

 per month install pressure/vacuum 

difference between the temperature 

ons. EPA has used 10 psi RVP and 

VP and temperatures representative 

d that 80% of the vehicle fleet will 

d by 80% for 2014 and increases 

es, EPA-457/B-12-001, August 7,